The party's central leadership had summoned Chief Minister Sarbananda Sonowal and Health Minister Himanta Biswa Sarma, both contenders for the top post.
The RTI activist, in an attempt to reach out to the people of the state, wrote several open letters from jail, highlighting problems that need to be addressed.
Chandrashekhar Rao congratulated Trinamool Congress chief Mamata Banerjee on the hat-trick win of her party in West Bengal and forming the government for third consecutive term
The Congress has established initial leads only on five seats while its partners Bodoland Peoples Front on two seats and All India United Democratic Front (AIUDF) on one seat.
A total of eight quakes jolted the state since Wednesday night and all originated in and around Tezpur, the National Centre for Seismology (NCS) said in its bulletin.
Three employees of the ONGC were on April 21 kidnapped by suspected ULFA-I militants from its Lakwa oilfield in Assam's Sivasagar district along the Assam-Nagaland border.
"Around 300 people created chaos at both places, mainly over payment of Rs 500 for the tests," Cachar district Additional Deputy Commissioner Sumit Sattawan said.
Whereabouts of the kidnapped employees were not known and kidnappers have not made any contact with the family or the company so far, a source in ONGC said.